Answer:
Super oxides contain the ion \[O_{2}^{-}\]
which has the structure \[{{(:\overset{.\,\,\,\,.}{\mathop{O}}\,\overset{.\,\,.\,\,\,.}{\mathop{-}}\,\overset{.\,\,\,.}{\mathop{O}}\,:)}^{-}}\]
containing a three electron bond, i.e., it has one unpaired electron and hence
is paramagnetic. Normal oxides containing the ion \[{{[:\underset{\,\,\,.\,\,\,.}{\overset{.\,\,\,.}{\mathop{O}}}\,:]}^{2-}}\]
do not have any unpaired electrons and hence are diamagnetic.
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